Who was sending the poison-pen letters in the little village of Prior's Umborne? The highstrung Rosebay Chantmerle? Her crippled sister, the dazzling Celandine? The recluse, Stanford Blick? His brother, Charles? Or the village busybody, Daniel Durdle? The arrogant financier, Sir Archibald Blick, wanted Nigel Strangeways to Find out - but then Sir Archibald was mysteriously found dead at the bottom of the dreadful hollow....